A totally reflecting disk has radius $9\mathrm{.}00$ mm$,$ thickness $3\mathrm{.}00$ mm$,$ and average density $7\mathrm{.}00102$ kg$/$m$3$kg$/$m$3.$ A laser has an average power output PavPav spread uniformly over a cylindrical beam of radius $2\mathrm{.}00$ mmmm$.$ When the laser beam shines upward on the disk in a direction perpendicular to its flat surface, the radiation pressure produces a force equal to the weight of the disk.

Part A

What value of PavPav is required?

Express your answer with the appropriate units.

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PavPav $=$

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Part B

What average laser power is required if the radius of the disk is doubled?

Express your answer with the appropriate units.